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Data Weighted Averaging for Simulink

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A group of Delta-Sigma SIMULINK- models with DWA mismatch shaping.



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The SIMULINK- models of multibit Delta-Sigma ADC and Delta-Sigma DAC all have a non-ideal D/A-converter.
The DAC mismatch noise will be shaped according to a general Data Weighted Averaging (DWA) transfer function 1±z^(-D), where D is a positive integer.

The DWA element selection logic calculates a selection vector. The selection vector chooses, which of the unit DACs will be used according to DAC input.

The DWA block is constructed using mainly fixed-point blocks.
Models for Incremental DWA (IDWA) were also added.

This package also includes a spurious tone estimator: the spurs can be estimated using the DS input signal and the DNL error shape.

Comments and Ratings (3)

Marko Neitola

Marko Neitola (view profile)

This model and the related paper (mentioned previously) were also a part of my Ph.D. thesis:

Marko Neitola

Marko Neitola (view profile)

The mismatch noise estimator was improved ad added to submission #29522: "Delta Sigma converter spurious tone predictor".

Both DWA mismatch noise model and DSM quantization noise models can be found in #29522.

Marko Neitola

Marko Neitola (view profile)

More information about this model:

Neitola, M., Rahkonen, T.: A Generalized Data-Weighted Averaging Algorithm. Circuits and Systems II: Express Briefs, IEEE Transactions on, Volume: 57 , Issue: 2, Publication Year: 2010 , Page(s): 115 - 119

Available on IEEE Xplore



A bugfix: the spur estimator now supports all DWA modes (i.e. noise shaping transfer functions).


Feature update: spurious tone estimator.
1. The stimulus is now created in matlab script.
2. The models are run by an m-file script.


Added three simulation models for Delta-Sigma D/A converters.


Major improvement. The DWA-DAC is now more realistic. Also added a model that uses incremental DWA.

MATLAB Release
MATLAB 7.10 (R2010a)

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